Update SUMMARY.md

SUMMARY.md

@@ -6,6 +6,7 @@
     * [Video mode initialization and transition to protected mode](Booting/linux-bootstrap-3.md)
     * [Transition to 64-bit mode](Booting/linux-bootstrap-4.md)
     * [Kernel decompression](Booting/linux-bootstrap-5.md)
+    * [Kernel load address randomization](Booting/linux-bootstrap-6.md)
 * [Initialization](Initialization/README.md)
     * [First steps in the kernel](Initialization/linux-initialization-1.md)
     * [Early interrupts handler](Initialization/linux-initialization-2.md)